Add comments to feed.iconURL and feed.faviconURL, explaining that these are set only if that info was part of the feed (which is a JSON-Feed-only feature).
Add comments to feed.iconURL and feed.faviconURL, explaining that these are set only if that info was part of the feed (which is a JSON-Feed-only feature).

brentsimmons/Evergreen,brentsimmons/Evergreen,brentsimmons/Evergreen,brentsimmons/Evergreen